Manufacturing Engineering Multiple Choice Questions on “Geometry of Twist Drills-1”.
1. Part of twist drill which carries flutes and extends from dead centre up to the start of the neck is known as
a) Body
b) Point
c) Lip
d) Chisel edge
Answer: a
Clarification: Body of twist drill carries flutes and extends from dead centre up to the start of a neck. This is the longest part of a twist drill.
2. Part of drill between neck and tang is known as
a) Body
b) Point
c) Shank
d) Chisel edge
Answer: c
Clarification: Shank of twist drill is between neck and tang.
3. Edge formed at extreme tip due to the intersection of flanks, is known as
a) Body
b) Point
c) Lip
d) Chisel edge
Answer: d
Clarification: Chisel edge is formed at extreme tip due to the intersection of flanks. It is at the extreme edge of chisel edge.
4. Cone shaped surface formed at the end of the flutes which contains dead centre, lips and flanks etc. is known as
a) Body
b) Point
c) Lip
d) Chisel edge
Answer: b
Clarification: Point is a Cone shaped surface formed at the end of the flutes which contains dead centre, lips and flanks etc. It is at the end part of the twist drill.
5. Main cutting part of drill is
a) Body
b) Point
c) Lip
d) Chisel edge
Answer: c
Clarification: Lip is the main cutting part of the drill and is also called cutting edge. Material removed first at chisel edge.
6. Intersection of each faces and flank form
a) Body
b) Point
c) Lip
d) Chisel edge
Answer: a
Clarification: Lip is the main cutting part of the drill and is also called cutting edge. It is formed at Intersection of each faces and flank.
7. Small clearance provided in diameter of twist drills adjacent to land is known as
a) Body clearance
b) Point clearance
c) Lip clearance
d) Chisel edge clearance
Answer: a
Clarification: Body clearance is provided in diameter of twist drills adjacent to land. This clearance help in the removal of material during cutting.
8. Which of the following help in reducing friction between drill and the walls of the hole in twist drills?
a) Body clearance
b) Point clearance
c) Lip clearance
d) Chisel edge clearance
Answer: a
Clarification: Body clearance reduces friction between drill and the walls. It helps in smooth drilling of holes during the operation.
9. Narrow flat surface running along flutes of twist drill on its leading edge is known as
a) Body
b) Point
c) Lip
d) Land
Answer: d
Clarification: Land is the narrow flat surface running along flutes of twist drill on its leading. It is the flat part of a twist drill.
10. Narrow flat surface running along flutes of twist drill on its leading edge is known as
a) Body
b) Point
c) Lip
d) Margin
Answer: d
Clarification: Margin is the narrow flat surface running along flutes of twist drill on its leading. It is also known as land.